PC, Admit to being guilty. Having a check out in a Super Cub with an instructor having not flown fixed wing for some time, doing circuits on a dirt cross runway and he hopped out after being satisfied, did a few solo and during rollout on one noticed a SAAB had landed on the main bitumen runway, never heard him, and obviously never saw him until it didn't matter. Never checked the radio set up after the instructor hopped out was probably the problem, long, long time ago.